Recently, there are customers and friends coming to our company to inquiries the principle and process of pressure transmitter. There are many types of pressure change, such as capacitive pressure resistance, Resonant Silicon but the most fundamental thing is the perception of the pressure -- the carrier received after the pressure diaphragm deformation occurred, after testing and then transmitted to the electronic transmission unit, converted to 4-20mA to the control room and the resistance is too large, too high impedance, resistance the electromagnetic interference ability of resistance strain gage external resistance can be designed by the designer, but the range of resistance should be noted: the resistance is too. Generally dozens of European to tens of thousands of Europe by the matrix material, metal wire or foil, insulating film and strain maintenance lead wire and other components according to different uses.
Field fault check
The failure of Ross Montel transmitter is mostly due to improper use and improper installation methods.
1. do not strictly comply with the technical requirements of the device, installation and site environment does not meet the technical requirements.
The above fault will cause the transmitter output is not normal or measurement is not accurate, but after careful inspection, in strict accordance with the requirements of use and installation technology, to take timely and effective measures, problems can be excluded, the fault can not be dealt with, should be sent to the laboratory or transmitter manufacturers do further examination.
2., if the pressure pipe is leaked or blocked, there are residual gas in the liquid filled pipe or residual liquid in the inflatable pipe. There are accumulations in the flange of the transmitter, and the dead zone is formed.
The 3. input pressure transmitter wiring is not correct, the power supply voltage is too high or too low, indicating that the connection between the meter head and the terminal of the instrument terminal is in bad contact.
4. components (Kong Ban, long pass measurement joint, etc.) are blocked or the device is not in the right form, and the pressure point is not reasonable.